框架上的Java Paint问题

Question

I am creating an object of another class from my main class using the following call:

JSplash splash = new JSplash();

However, when I create this object it performs the constructor of the JSplash class and gives my window and my button. But it does not paint on the frame. Can you please assist me with this?

import java.awt.Color;
import java.awt.Font;
import java.awt.Graphics;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JButton;
import javax.swing.JFrame;

/**
 *
 * @author Curtis
 */
public class JSplash extends DFrame implements ActionListener {
//declaration of variable objects
    Font myFont = new Font("Arial", Font.BOLD, 20);
    JButton myButton = new JButton("Click Me!");
    Color bgColor = new Color(0, 0, 255);
    Color firstColor = new Color(255, 255, 255);
    String first = "Welcome to DaemoDynamics!";
    String last = "Click the Button";
    String middle = "";
    String middle2 = "";
    private static int count = 1;
    DFrame splash = new DFrame();
//Constructor
    public JSplash() {
        setDefaultLookAndFeelDecorated(true);
        System.out.println("Hello");
        setDefaultCloseOperation(JFrame.HIDE_ON_CLOSE);
        splash.add(myButton);
        getContentPane().setBackground(bgColor);
        //adds action listener
        myButton.addActionListener(this);
        splash.setVisible(true);
    }
//Paint method
    @Override
    public void paint(Graphics e) {
        System.out.println("paint is being reached");
        super.paint(e);
        e.setFont(myFont);
        e.setColor(firstColor);
        e.drawString(first, 14, 80);
        e.drawString(last, 70, 240);
        e.drawString(middle, 75, 150);
        e.drawString(middle2, 60, 175);
    }

//Listener Method
    @Override
    public void actionPerformed(ActionEvent e) {
        //First Time button hit
        if (count == 1) {
            middle = "Brighter Business";
            middle2 = "for A Brighter Future";
            last = "Click Again to Begin";
            repaint();
            //increases button count
            count++;
        } else//if button count is not 1
        {
            splash.setVisible(false);
            FinalProject app = new FinalProject();
        }
    }
}

Answer 1

You've create a NEW DFrame inside you JSplash constructor and then ADDED your components to IT. This is simply not required. Remove the reference's to splash and simply use the DFrame you've extended. And while i'm looking at, splash has no layout manager, which isn't going to help. The paint method is never going to be called, because the window that's displayed on the screen is never the JSplash , but the DFrame you created (called splash)

Answer 2

Create a new class that extends JPanel. Ensure your button is added to that panel and override the paintComponent() method of that panel with your logic. This should work.

Refer here.

Custom painting should be done in paintComponent method. Ideally you should not override the paint method of a JFrame.